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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a99c72bd36764c938ece2ce7440e9314b2591a6146e4961ef4a1fe42a69cd05' 
  AND token = 'l7q45LfQuk6x4+pSjmYdWHAEuZg0WSF9eNAVOCvDptE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}